Unique Identifier (UID): All ISO-compliant smart cards are provided with a UID number (a kin to a VIN number on a vehicle). For interoperability purposes, a card's UID is open and available to be read by all compliant readers. Since this unique number is not secured by keys, reading the UID of a smart card is comparable to reading a proximity card, mag stripe card or other technology that utilizes open, unsecured numbers.
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